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generics again wildcards

 
Ranch Hand
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in this code snippet ,method argument Stats<? > i havent seen in any book.This is from some web site.What does it mean.
I know about (List<?> ob )or List<? extends ...> but Stats -is class here ,nt some collection .???

class Stats<T extends Number >
boolean sameAvg(Stats<?> ob) {
if(average() == ob.average())
return true;

return false;
}
}
 
Greenhorn
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Hi Lucky,

It seems that Stats is the user defined class only.

The Java SE API don't have any Stats class.

and, it also look like the example is not complete, as the average() method is missing in the Stats class.

Please provide some more information for this example.
 
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